Mining roof support cylinder corrosion protection apparatus and method
a technology of corrosion protection apparatus and mining roof support, which is applied in mining structures, excavations, artificial islands, etc., can solve the problems of reducing the life of certain parts of costly mining equipment, and reducing the life of exposed metal surfaces. , to achieve the effect of preventing costly rebuilding and replacement of parts, repair, and reducing the cost of maintenan
Inactive Publication Date: 2007-07-12
AVISTAR
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- Application Information
AI Technical Summary
Benefits of technology
Significantly reduces replacement and maintenance costs by creating a non-corrosive environment around the cylinders, extending their lifespan and avoiding costly rebuilding or use of sacrificial barriers, while being easy to install and remove.
Problems solved by technology
This provides a substantial cost saving and it has not been recognized by those in the industry.
Currently exposed metal surfaces are subject to a corrosive environment by hydrogen sulfide gas and water spray mist.
Due to the corrosion, the life of certain parts of costly mining equipment is shortened significantly.
Method used
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[0023] In FIG. 1 there is shown a typical mine roof support 10. The support has a ground-engaging base 11 and a roof-engaging canopy or roof engaging support 12, a rear shield 13 and pivoting links 14. There are pair of hydraulic support legs 15 which act between the roof engaging support 12 and the base 11. The hydraulic cylinder roof support legs 15 may not normally experience repeated full extension and retraction when the roof support 10 is in place during mining operations. This exposes the surfaces of the hydraulic legs 15 to corrosive gases within the mine for long periods where the hydraulic cylinder legs 15 are not wiped with a hydraulic fluid to form any barrier against corrosion. Therefore, corrosion is likely to occur and does occur on the surfaces of bronze plated hydraulic cylinder legs or cylinders with other surface materials, especially in mines where hydrogen sulfide gas is present.
[0024] In FIG. 1, there is shown a nitrogen or other non-corrosive gas supply 16, a...
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Abstract
A roof support for an underground mine which has a hydraulic cylinder positioned between a roof engaging support and a ground engaging base and has a flexible gas barrier or enclosure surrounding surfaces of said hydraulic cylinder which are subject to corrosion by gases present in the underground mine. Continuous flowing non-corrosive gas such as nitrogen is supplied to a space between the gas barrier and said hydraulic cylinder for preventing corrosion of cylinder surfaces by corrosive gases present in the mine which may include hydrogen sulfide.
Description
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] This invention relates to a corrosion protection system and a method of protecting certain articles from corrosion by enclosing the articles in a suitable enclosure and flushing the interior space of the enclosure with a continuous flow of non-corrosive gas, thereby preventing ambient corrosive gasses (or other corrosive agents) from contacting the protected articles. [0003] This invention relates to movable, semi-permanent or temporary roof supports and cylinders used in coal mining or other underground mining. Movable, semi-permanent or temporary roof support apparatuses generally employ a roof engaging support and a ground-engaging base with hydraulic roof support cylinders positioned between a roof engaging support and a ground-engaging base. Hydraulic roof support cylinders are used in coal mining operations where gases or other agents, which are corrosive to cylinder exterior surfaces, may be present. [0004] 2...
Claims
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IPC IPC(8): E02D17/00
CPCE21D23/03
InventorRANDLETT, LAWRENCE ALANWILLARD, STEVEN FRANK
OwnerAVISTAR